Consolidated Statements of Net Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Net sales	$ 285,441	$ 219,398
Cost of sales	171,791	132,243
Gross profit	113,650	87,155
Selling, general, and administrative expenses	46,703	42,366
Research and development expenses	12,151	8,565
Amortization of intangibles	5,944	3,796
Total operating expenses	64,798	54,727
Operating income	48,852	32,428
Interest expense	3,120	2,045
Foreign exchange (gain) loss	(1,557)	3,823
Other expense (income), net	(139)	(517)
Income before income taxes	47,428	27,077
Income taxes	8,537	7,788
Net income	$ 38,891	$ 19,289
Income per share:
Basic (in dollars per share)	$ 1.71	$ 0.86
Diluted (in dollars per share)	$ 1.69	$ 0.85
Weighted-average shares and equivalent shares outstanding:
Basic (in shares)	22,748	22,438
Diluted (in shares)	22,989	22,621